<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        img {
            width: 200px;
            height: 200px;
        }
    </style>
</head>

<body>
    <div id="app">
        <!-- 结构的消失与 创建 -->
        <!-- <p v-if="false">p标签</p> -->
        <button @click="Show">点击</button>
        <p v-if="isShow">p标签</p>
        <p v-if="age>20">p标签</p>



    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                isShow: false,
                age: 22
            },
            methods: {
                Show() {
                    this.isShow = !this.isShow
                }
            }

        })
    </script>
</body>

</html>